# Multiverse in an inverted island

@article{Langhoff2021MultiverseIA, title={Multiverse in an inverted island}, author={Kevin Langhoff and Chitraang Murdia and Yasunori Nomura}, journal={Physical Review D}, year={2021} }

Kevin Langhoff, Chitraang Murdia, and Yasunori Nomura 2, 3 Berkeley Center for Theoretical Physics, Department of Physics, University of California, Berkeley, CA 94720, USA Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, Kashiwa 277-8583, Japan

## 9 Citations

Islands in multiverse models

- PhysicsJournal of High Energy Physics
- 2021

Abstract
We consider multiverse models in two-dimensional linear dilaton-gravity theories as toy models of false vacuum eternal inflation. Coupling conformal matter we calculate the Von Neumann…

Cosmologies, singularities and quantum extremal surfaces

- Physics
- 2021

Following arXiv:2012.07351 [hep-th], we study quantum extremal surfaces in various families of cosmologies with Big-Crunch singularities, by extremizing the generalized entropy in 2-dimensional…

Islands and the de Sitter entropy bound

- Physics
- 2021

The de Sitter (dS) entropy bound gives the maximal number of e-folds that noneternal inflation can last before violating the thermodynamical interpretation of dS space. This semiclassical argument is…

Free fermion entanglement with a semitransparent interface: the effect of graybody factors on entanglement islands

- PhysicsSciPost Physics
- 2021

We study the entanglement entropy of free fermions in 2d in the
presence of a partially transmitting interface that splits Minkowski
space into two half-spaces. We focus on the case of a single…

Island for gravitationally prepared state and pseudo entanglement wedge

- PhysicsJournal of High Energy Physics
- 2021

Abstract
We consider spacetime initiated by a finite-sized initial boundary as a generalization of the Hartle-Hawking no-boundary state. We study entanglement entropy of matter state prepared by…

Entanglement between two evaporating black holes

- Physics
- 2021

We study a thermo-field double type entangle state on two disjoint gravitating universes, say A and B, with an eternal black hole on each. As was shown previously, its entanglement entropy of the…

A comment on a fine-grained description of evaporating black holes with baby universes

- Physics
- 2021

We study a partially fine-grained description of an evaporating black hole by introducing an open baby universe with a boundary. Since the Page’s calculation of the entropy of Hawking radiation…

Entanglement of Initial State and Pseudo Entanglement Wedge

- 2021

We consider spacetime initiated by a finite-sized boundary on which a pure initial matter state is set as a natural generalization of the Hartle-Hawking noboundary state. We study entanglement…

Entanglement Phase Structure of a Holographic BCFT in a Black Hole Background

- Physics
- 2021

We compute holographic entanglement entropy for subregions of a BCFT thermal state living on a nongravitating black hole background. The system we consider is doubly holographic and dual to an…

## References

SHOWING 1-10 OF 97 REFERENCES

When Worlds Collide

- Physics
- 2007

We analyze the cosmological signatures visible to an observer in a Coleman-de Luccia bubble when another such bubble collides with it. We use a gluing procedure to generalize the results of…

Colliding with a crunching bubble

- Physics
- 2007

In the context of eternal inflation we discuss the fate of Lambda = 0 bubbles when they collide with Lambda< 0 crunching bubbles. When the Lambda = 0 bubble is supersymmetric, it is not completely…

Hawking-Moss bounces and vacuum decay rates.

- Physics, MedicinePhysical review letters
- 2007

It is shown that such HM bounces do not give reliable rate calculations, but are instead related to the probability of finding a quasistable configuration at a local potential maximum, using a nongravitational example with analogous properties.

Reanalyzing an evaporating black hole

- PhysicsPhysical Review D
- 2019

Author(s): Nomura, Y | Abstract: © 2019 authors. Published by the American Physical Society. A coherent picture of the quantum mechanics of a collapse-formed, evaporating black hole is presented. In…

The Page curve of Hawking radiation from semiclassical geometry

- Physics
- 2019

We consider a gravity theory coupled to matter, where the matter has a higher-dimensional holographic dual. In such a theory, finding quantum extremal surfaces becomes equivalent to finding the…

Physical theories, eternal inflation, and the quantum universe

- Physics
- 2011

A bstractInfinities in eternal inflation have long been plaguing cosmology, making any predictions highly sensitive to how they are regulated. The problem exists already at the level of…

Bulk reconstruction and the Hartle-Hawking wavefunction

- Physics
- 2017

In this work, a relation is found between state dependence of bulk observables in the gauge/gravity correspondence and nonperturbative diffeomorphism invariance. Certain bulk constraints, such as the…

A quantum measure of the multiverse

- Physics
- 2013

It has been recently suggested that probabilities of different events in the multiverse are given by the frequencies at which these events are encountered along the worldline of a geodesic observer…

Holographic framework for eternal inflation

- Physics
- 2006

In this paper we provide some circumstantial evidence for a holographic duality between bubble nucleation in an eternally inflating universe and a Euclidean conformal field theory (CFT). The…

Inflationary Cosmology after Planck 2013

- Physics
- 2014

I give a general review of inflationary cosmology and of its present status, in view of the 2013 data release by the Planck satellite. A specific emphasis is given to the new broad class of theories,…